vac vs dc..or combo

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Forum topic by ducky911 posted 06-13-2014 02:07 PM 1024 views 0 times favorited 4 replies Add to Favorites Watch
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237 posts in 3026 days

06-13-2014 02:07 PM


I have been researching a way to improve my dust setup. I have a 2hp 220 v dc with a just installed internal thien seperator. I have 6” pvc pipe to 4” drops to most areas of my shop.

Anyway I been thinking of going bigger hp but got to thinking( ?) where did I need it? My chopsaw back dust port, my over blade table saw port (saw stop) and my drill press are the weak points. All these weak points are where I am necking down to 1.5”. My router, tablesaw bottom, jointer, planer, and drum sander are working without issues.

It seams that my shop vac does much better at the 1.5” piping then my dc does necked down to 1.5”. So I was wondering if it would be a better idea to pipe a small diam. second system with a shop vac. It seems that vacs are less effected by piping as they put whole house vacs in homes.

Pretty pricey but found this

Or would a 5hp dc necked down to 1.5” equal a shop vac



4 replies so far

View Bill White's profile

Bill White

5148 posts in 4197 days

#1 posted 06-13-2014 02:18 PM

You will not get the air flow needed by reducing the dust collector to 1.5”pipe.


View HorizontalMike's profile


7770 posts in 3151 days

#2 posted 06-13-2014 02:44 PM

I use my 16gal shopvac with a Grizzly plastic separator lid (~$30) that is equal to a Thien baffle for my mitersaw and it works great. I also added a hepa filter to the shopvac.

A shopvac is high suction/speed and LOW volume, which is ideal for your 1.5in to 2in hose. One caveat though—it will not work well if you are thinking about hooking up a long hose run to all three machines, even if you have two gates shut. A long hose run will kill the shopvac capacity quickly.

-- HorizontalMike -- "Woodpeckers understand..."

View English's profile


660 posts in 1714 days

#3 posted 06-13-2014 09:32 PM

I would go to larger duct at all three locations, I have 6” duct to my drill press, 6 ” duct to the miter saw, and 4” duct to my saw stop over table dust hood with another 4” to the blade shroud.

On the Saw Stop the duct comes down from overhead as 6” and reduces to 4” about 2’ above the hood. I just couldn’t figure a way to get 6” hose on a over table hood. I made my own hood for the saw stop. The one Saw Stop sells has a restriction at the back of the hood where it reduces down to 1/4” by about 1.5”. This small size will only work with a shop vac. None of the DC’s on the market for Woodworking can supply the vacuum needed for their hood to work correctly. My hood has so much suction it will suck up small cutoff up the pipe and carry them to the DC. To see a picture of this arrangement see:

I used 6” on my miter saw. I have a box similar to the one shown in your shop pictures. At the bottom back of the box there is a 1” x 24” slot, all the way across the back of the box. The slot is also in the top of a 6” x 6” x 24” box with a 6” fitting in the end. The 1” x 24” slot is a little less area than the area of the 6” duct. I get even draw down the slot all the way across. I get very good pick up at the miter saw very little escapes. To see a picture of this see:

At the drill press I have a 6” hose that I place next to my drill bit when in use and clamp it in place. One pick up location doesn’t always work on a drill press. To see a picture of this see:

I am still working on the collection hoods for several of my machines it seems it is all ways a work in progress!!

-- John, Suffolk Virgina

View ducky911's profile


237 posts in 3026 days

#4 posted 06-13-2014 09:43 PM

thanks for the info. Looks like I got some work to do.

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